Still extremely confused, it's the same as it's always been!!
Taken 4 minutes ago:
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You aren't seeing the different because your monitor seems to be only a little bit larger than the width of the content, i'd guess your monitor is about 1200 pixels wide? If it was wider you'd see the white space to the right of the content.
Because web developers say 1024x768 is best for web pages.
This is because people were using this size screen back with WinXP and few people have them today.
We don't say it's best, we aim for that on fixed sizes because 1024 wide is still one of the most common resolutions of monitors. The thing is for years we have also been centerting fixed width sites so the unused space is even on either side of the content. The website you're on now is doing that exact same thing, it's designed to fit 1024 wide browsers but it's centered. The new youtube design is not, it's left aligned so the wider your monitor the bigger the white space to the right of the page.
Anyway adjusting your resolution is not the fix, just use one of many add-on scripts.